and little-known Arctic Spiders. 281 



This species is nearly allied to L. tenehricola^ Wid., though 

 perhaps more nearly still to L. leprom^ Ohl., being larger than 

 L. tenehricola ; but it differs decidedly from both these species 

 as well in the structure of the male palpal organs as in the 

 form of the genital aperture of the female. 



Linyphia tiirhatrix^ sp. n. 



This spider is similar in size to L, tenehricola, and re- 

 sembles it also very nearly in colours and markings ; the 

 adult female, however, may be at once distinguished by a 

 rather slender prominent bent process directed backwards from 

 the larger process connected with the genital aperture. 



Two adults (both females) were received in 1872 from Mr. 

 E. Whymper, by whom they were found in North Greenland. 

 The male is unknown to me. 



Fam. Thomisides. 



Gen. Thanatus (Koch). 



Thanatus formicinus ? 



Aranms forvncinus, Clk. Aran. Suec. Stockholm, 1757. 



Arunea rhombuica, Walck. Faun, Par. ii. p. 228, et Thomisus rhomboieus, 



Tabl. d. Ar. p. 38. 

 Thomisus rhomboieus, Hahn, Die Arachn. i. p. Ill, tab. xxviii. fig. 83, 

 Philodromus formicinus, Sund. 1832, p. 229. 

 Philodromus rhombiferens, Walck. Ins. Apt. i. p. 559. 

 Thanatus formicinus, Koch, Uebers. des Ar.-Syst. i. p, 28. 



An immature female of what I believe to be this species was 

 sent to me by Mr. E. Whymper in 1870. It was found by 

 him near Jakobshavn, North Greenland, towards the end of 

 June. Although found in Sweden, and generally distributed 

 throughout Europe, Western Asia, and North Africa, Thana- 

 tus formicinus , Clk., has never yet been recorded in the British 

 Islands. 



Dr. T. Thorell ((Efv. af K. Vet.-Akad. Forh. 1872, p. 157) 

 describes a Thanatus from Disco Island, Greenland [Thanatus 

 arcticus, sp. n.), with which the spider I have above recorded 

 is perhaps identical. 



Fam. Lycosides. 



Gen. Lycosa, Latr. (ad partem). 



Lycosa glacialis. 

 Lycosa glacialis, Thor. CEfvers. K. Vet.-Akad. Forh, 1872, No. 2, p. 159. 

 Numerous examples, some adult, but mostly immature, of 



